《夕(xī)阳》是一幅(fú)用叶脉(mài)标本制成的画。制作这幅画,要先做好叶脉标本,然后再用一些叶脉标本在图画背景上进行组合、粘(zhān)贴(tiē)。制作叶脉标本的过程是:先把500毫升清水倒(dào)进烧杯(bēi),放进12郾5克碳(tàn)酸(suān)钠(nà)和17郾5克氢(qīng)氧(yǎ An “xī yang” is a picture made of a specimen of a vein. Make this picture, we must first make a vein specimen, and then use some vein specimens in the background of the picture combination, sticky (zhān) paste (tiē). The process of making a vein sample is: first pour 500 ml of water into a beaker, add 12 郾 5 g of sodium (nà) and 17 郾 5 g of hydrogen (yǎ